Accelerating in-browser tasks of an unprivileged web application

A computer system, comprising:

• a processor system;
• and
• a computer storage medium that stores computer-executable instructions that are executable by the processor system to perform operations comprising:
• establishing a communications channel between 1) a first web application executing within a first browsing context of a web browser, and 2) a second web application executing within a second browsing context of the web browser, wherein,
• the first browsing context is not cross-origin isolated,
• the second browsing context is cross-origin isolated, and
• establishing the communications channel includes:
• loading a proxy page within a third browsing context of the web browser, loading of the proxy page being initiated by the first browsing context, wherein content of the proxy page is served from an origin associated with the second web application;
• and
• loading a worker instance using a script provided by the proxy page;
• passing a first message through the communications channel from the first web application to the second web application, the first message requesting performance of a compute job by the second web application, wherein,
• the compute job is one of video encoding, machine learning training, machine learning inference, or a blockchain operation,
• the compute job relies on an API (Application Programming Interface) that is inaccessible by the first web application based on the first browsing context not being cross-origin isolated, and that is accessible by the second web application based on the second browsing context being cross-origin isolated, and
• the first message comprises a first object of a transferable object type and the communications channel and passes the first object from the first web application to the second web application without copying the first object;
• and
• passing a second message through the communications channel from the second web application to the first web application, the second message comprising a result of the compute job, wherein the second message comprises a second object of the transferable object type and the communications channel and passes the second object from the second web application to the first web application without copying the second object.

A computer storage medium that stores computer-executable instructions that are executable by a processor system to perform operations comprising:

• establishing a communications channel between 1) a first web application executing within a first browsing context of a web browser, and 2) a second web application executing within a second browsing context of the web browser, wherein,
• the first browsing context is not cross-origin isolated,
• the second browsing context is cross-origin isolated, and
• establishing the communications channel includes:
• loading a proxy page within a third browsing context of the web browser, loading of the proxy page being initiated by the first browsing context, wherein content of the proxy page is served from an origin associated with the second web application;
• and
• loading a worker instance using a script provided by the proxy page;
• passing a first message through the communications channel from the first web application to the second web application, the first message requesting performance of a compute job by the second web application, wherein,
• the compute job is one of video encoding, machine learning training, machine learning inference, or a blockchain operation, and
• the compute job relies on an API (Application Programming Interface) that is inaccessible by the first web application based on the first browsing context not being cross-origin isolated, and that is accessible by the second web application based on the second browsing context being cross-origin isolated;
• and
• passing a second message through the communications channel from the second web application to the first web application, the second message comprising a result of the compute job.